@misc{indiciaedf7e6c274ac3,
  title = {An analysis of satellite state vector observability using SST tracking data},
  author = {Englar, T. S., Jr. and Hammond, C. L.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19770018283},
  note = {Source identifier: 19770018283}
}